In almost every place where we find totems we also find a law against persons of the same totem having sexual relations with one another and consequently against their marrying. This, then, is 'exogamy', an institution related to totemism.

I think that in general it is a good plan occasionally to bear in mind the fact that people were in the habit of dreaming before there was such a thing as psychoanalysis.

A love that does not discriminate seems to me to forfeit a part of its own value, by doing an injustice to its object; and secondly, not all men are worthy of love.

The facts which have caused us to believe in the dominance of the pleasure principle in mental life also find expression in the hypothesis that the mental apparatus endeavours to keep the quantity of excitation present in it as low as possible or at least to keep it constant.

To be completely honest with oneself is the very best effort a human being can make.

If you can't do it, give up!

If it's not one thing, it's your mother.